Lettuce

Foxglove Aphid

Scientific Name: Aulacorthum solani

Foxglove aphid is usually light green with darker green spots at the
base of the cornicles but has several color forms, ranging from green to orange
to pink. Some of the wingless aphids have many black markings on the top of the
abdomen as well. The winged adults are browner in color than the wingless
forms, but also have various black markings.

Foxglove aphid is a pest of lettuce in California's Central
Coast, although it may also occur on other crops. Winged aphids are nearly
indistinguishable in the field from another pest of lettuce, the lettuce aphid
(Nasonovia ribis-nigri). These two
aphids, however, can be distinguished from green peach aphid, which has prominent, converging antennal
tubercles.

Foxglove aphid has a very short life cycle and populations can
build rapidly. It has a wide host range.

Monitoring requires care in order not to miss early infestations
that are hidden within the lettuce. This aphid has a tendency to disperse in
the plant rather than forming colonies as green peach aphid does. Control of
this aphid is difficult because of its rapid population growth combined with
its preferred locations deep within the head.

Common name

Amount to Use

R.E.I.+

P.H.I.+

(trade name)

(hours)

(days)

When choosing a pesticide, consider information relating to the impact
on natural enemies and honey bees and environmental impact. Not all registered pesticides are listed. Always read label of product being used.

A.

IMIDACLOPRID

(Admire Pro)

7–10.5 fl oz/acre

12

21

MODE OF ACTION GROUP NUMBER1: 4A

COMMENTS: Apply as a soil application. Do not apply more than 0.38 lb a.i. of imidaclophid/acre/year.

. . . or . . .

(Provado 1.6F)

3.75 fl oz

12

7

MODE OF ACTION GROUP NUMBER1: 4A

COMMENTS: Do not apply more than 0.24 lb a.i. of imidacloprid/acre/year.

B.

OXYDEMETON-METHYL*

(MSR Spray)

1.5–2 pt/acre

72

See label

MODE OF ACTION GROUP NUMBER1: 1B

COMMENTS: Do not apply more than 3 times/season. Labeled for head lettuce only.

C.

DIMETHOATE

(Dimethoate 267)

0.75 pt

48

Head lettuce: 7

MODE OF ACTION GROUP NUMBER1: 1B

Leaf lettuce: 14

COMMENTS: Some products only allow use on leaf lettuce; be sure to confirm on label the type of lettuce product is registered for.

D.

ACETAMIPRID

(Assail 70WP)

0.8–1.2 oz/acre

12

7

MODE OF ACTION GROUP NUMBER1: 4A

COMMENTS: Foliar application. Allow 7 days between applications with a maximum of 5 applications/season.

E.

PYMETROZINE

(Fulfill)

2.75 oz

12

7

MODE OF ACTION GROUP NUMBER1: 9B

F.

FLONICAMID

(Beleaf 50SG)

2–2.8 oz

12

0

MODE OF ACTION GROUP NUMBER1: 9C

G.

SPIROTETRAMAT

(Movento)

4–5 fl oz

24

3

MODE OF ACTION GROUP NUMBER1: 23

+

Restricted entry interval (R.E.I.)
is the number of hours (unless otherwise noted) from treatment until the
treated area can be safely entered without protective clothing. Preharvest
interval (P.H.I.) is the number of days from treatment to harvest. In some
cases the REI exceeds the PHI. The longer of two intervals is the minimum time that must elapse before harvest.

*

Permit required from county agricultural commissioner for purchase or use.

1

Rotate chemicals with a different
mode-of-action Group number, and do not use products with the same
mode-of-action Group number more than twice per season to help prevent the
development of resistance. For
example, the organophosphates have a Group number of 1B; chemicals with a 1B
Group number should be alternated with chemicals that have a Group number
other than 1B. Mode of action Group numbers are assigned by IRAC (Insecticide
Resistance Action Committee). For additional information, see their Web site at http://www.irac-online.org/.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.